Scenario—RAID-1 Volumes (Mirrors)

RAID-1 volumes provide a means of constructing redundant volumes. Thus, when a partial
or complete failure of one of the underlying RAID-0 volumes occurs, there is
no data loss or interruption of access to the file systems. The
following example, drawing on the scenario explained in Chapter 5, Configuring and Using Solaris Volume Manager (Scenario) and continued in Scenario--RAID-0 Volumes,
describes how RAID-1 volumes can provide redundant storage.

As described in Scenario--RAID-0 Volumes, the sample system has two RAID-0 volumes. Each
volume is approximately 27 Gbytes in size and spans three disks. By creating
a RAID-1 volume to mirror these two RAID-0 volumes, a fully redundant storage
space can provide resilient data storage.

Within this RAID-1 volume, the failure of either disk controller does not
interrupt access to the volume. Similarly, failure of up to three individual disks
might be tolerated without access interruption.